61253508551 has 2 divisors, whose sum is σ = 61253508552. Its totient is φ = 61253508550.

The previous prime is 61253508443. The next prime is 61253508559. The reversal of 61253508551 is 15580535216.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61253508551 - 2¹⁸ = 61253246407 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61253508499 and 61253508508.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61253508559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30626754275 + 30626754276.

It is an arithmetic number, because the mean of its divisors is an integer number (30626754276).

Almost surely, 2^61253508551 is an apocalyptic number.

61253508551 is a deficient number, since it is larger than the sum of its proper divisors (1).

61253508551 is an equidigital number, since it uses as much as digits as its factorization.

61253508551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 180000, while the sum is 41.

The spelling of 61253508551 in words is "sixty-one billion, two hundred fifty-three million, five hundred eight thousand, five hundred fifty-one".